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Magnitude 8.6 Earthquake in Sumatra--Why no tsunami?

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Published on Apr 12, 2012

UPDATED to include AFTER SHOCKS
Two earthquakes (M8.6 and 8.2) occurred off the coast of Sumatra on April 11, 2012.
Why didn't they generate a tsunami as the 9.0 did in 2004?
Watch this animation and learn more at:
http://www.iris.edu/hq/retm
and
http://earthquake.usgs.gov/earthquake...

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